Method of applying friction materials to threaded article

Coating processes – Nonuniform coating – Applying superposed diverse coatings or coating a coated base

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427265, 427287, 427295, 427348, 4273745, 427375, 427409, B05D 102, B05D 500, B05D 700

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active

042685443

ABSTRACT:
A method of providing a uniform tightly adhered solid substantially continuous deposit of a friction-producing resin, such as nylon, in the bottom of the thread grooves of a threaded metal member, preferably of the type in which the threads' surfaces are identified in the trade as phosphate or phosphated surfaces, which comprises forming a 1-3% alcohol flow-promoting solution of a polymeric material selected from a group consisting of acrylic material, polyesters, polyvinyl acetates and nylons, applying the solution to the area of the threads in which the friction-producing deposit is to be made to form a thin uniform film of the solution on the thread surfaces, preparing a substantially aqueous viscous fluid mixture of the cured friction-producing resin powder, applying the mixture to the coated threaded surfaces to form in the thread grooves a deposit concentrated in the bottom of the thread grooves to a depth sufficient to interfere with at least the crests of threads of a mating threaded member, drying the mixture to eliminate the liquid from the mixture, thereafter heating the mixture to fuse the particles of the resin powder to produce a substantially continuous fluid deposit of fused resin, and finally cooling the article to cause the fused resin to solidify into a substantially solid continuous friction-producing deposit.

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